CN1710759A - Method for constituting compact-type He-Ne laser and apparatus thereof - Google Patents
Method for constituting compact-type He-Ne laser and apparatus thereof Download PDFInfo
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- CN1710759A CN1710759A CN 200410040005 CN200410040005A CN1710759A CN 1710759 A CN1710759 A CN 1710759A CN 200410040005 CN200410040005 CN 200410040005 CN 200410040005 A CN200410040005 A CN 200410040005A CN 1710759 A CN1710759 A CN 1710759A
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Abstract
Discharge tube with cross section in crisscross shape or multiple sections of crisscross distributed symmetrically is adopted in the invention. Using discharge in radio frequency to excite gases of mixing helium and neon, and using two mirrors to stabilize resonant cavity solve issue of outputting large power of helium - neon laser obtained under short laser tube. The disclosed device is applicable to laser medical treatment, laser biology, laser stage lighting, laser information recording and processing etc.
Description
Technical field the present invention relates to optics and optical engineering field, mainly is that the employing cross section is the discharge tube of a cross or the many star sections of a symmetry distribution and method and the device thereof that rf discharge excitation obtains big He-Ne Lasers power output.
The helium neon laser that background technology is general forms laser by circular cross section He-Ne gas discharge capillaceous.As, the U.S.'s said helium neon laser of US-4429399 patent is exactly an example.This laser tube structure will improve laser output power, must increase discharge tube length.When discharge tube is very long, use very inconvenient.China insults a ring, and to have invented by cross section be the helium neon laser made of the discharge tube of rectangle (patent of invention authorization number 85100563), makes the laser output of one meter long device rise to 1.5 times of circular section pipe output, or higher.Its shortcoming is that the long limit of the square-section of pipe can not be oversize, and oversize then discharge instability will use large-sized chamber mirror with the duration limit is oversize, and this is also inconvenient.In addition, radio frequency discharge has been widely used in gas discharge laser, and in 20th century the seventies just successfully be used for helium neon laser (P.W.Smith, AppliedPhysics Letters, Vol.19, No.5 1971,132-134), radio frequency discharge is that special-shaped discharge tube discharge brings certain convenience.
Summary of the invention the objective of the invention is to make up to be provided a kind of and can obtain under shorter discharge tube situation than equal length pipe, helium neon laser that the quarter bend power output is bigger.
The helium neon laser that the constructed high power He-Ne laser that provides of the present invention is made up of the radio-frequency power supply of he-ne laser tube, optical resonator and laser, the inwall that it is characterized in that limiting the discharge tube of active medium is being a cross or a symmetry many star sections that distribute perpendicular to the axial discharge cross section of discharge tube, and the center of star section is all on the axis of discharge tube.Each star section is made up of two slab region, and the ratio of the length bidimensional yardstick of slab region is comparatively moderate with 10: 1.Like this, utilize bond length to guarantee enough laser gains, utilization suitably increases the elongated edge size provides bigger mode volume, and the mode volume with discharge tube of many crosss tangent plane will be very big, can take into account the factors that influence improves power output.Therefore, the laser that this construction method provides is compared with the circular section or the square-section discharge tube of same discharge length, and its power output is much bigger, and facula area is also much bigger.
Helium neon laser provided by the invention is compared with existing helium neon laser, has advantages such as power output is big, structure is very compact, and cost is low, and the life-span is long, is convenient to produce, and is easy to use.Can use for the application scenario of demand high-power helium-neon lasers such as laser medicine, laser biology, laser stage lighting, laser intelligence record and processing.
Description of drawings Fig. 1 is the schematic diagram of the helium neon laser that provides of this construction method, wherein 1 is the deielectric-coating completely reflecting mirror, 2 is the deielectric-coating partially reflecting mirror, also be laser output mirror, 3 is quartz or glass discharge vessel, the 4 diesis tee sections for symmetrical distribution, 5 is quartz or glass medium bar, they are divided into the diesis district to discharge tube, and 6 is the charge and exhaust pipe of discharge tube, are used for pumping high vacuum and fill helium, neon gaseous mixture.7 for being used for the metal transport tape of radio frequency discharge, and 8 for being used to adjust the inductance coil of discharge homogenizing, and 9 is radio-frequency power supply, general 10-20MHz.Fig. 2 is the transverse cross-sectional view of discharge tube 3, and a represents that the minor face of a slab region of star section is long among the figure, and b represents the long edge lengths of slab region.Fig. 3 is the schematic perspective view of quartz or glass medium bar 5 among Fig. 1, it is long to be l, shorter slightly than discharge tube, height is h, and h subtracts the poor of a/2 for the discharge tube inside radius, the end is a cylinder, the angle on both sides, cross section is θ, when cross only, and θ=90 °, θ=45 ° during two crosses, θ=360 °/4N then during N cross.Fig. 4 is for obtaining the processing schematic diagram that medium strip shown in Figure 3 is drawn, and is a sectional view, and broken circle is represented quartz or glass pole, and solid line is represented after processing the part that keeps, i.e. medium strip, and the radius of curvature of arc S is identical with the radius of curvature of discharge tube 3 inwalls.
Embodiment high power He-Ne laser provided by the invention can be by following scheme implementation.Discharge tube 3 employing walls are thicker, pipe is straight and uniform circular quartz of internal diameter or glass tube.Get eight quartz or glass bars that diameter is close with discharge tube 3 inside radius, place on the stabilized platform and fix, both sides are highly being that location side's bar of h clamps it, at first use and be about 20cm, positive mild steel grinding tool for negative cylinder, negative cylindrical curvature radius is identical with the discharge tube inside radius, with grinding tool join diamond dust with a side grinding of pole for and the identical cylinder of pipe 3 internal diameters, again quartz or glass bar are changeed 90 °, with glue that its bottom and platform is temporarily fixing, be about 20cm with another again and have angle theta (should be smaller), deeply join diamond dust it is worn into as shown in Figure 3 bar, all note polishing after twice processing for the mild steel V-shaped groove of h.What a a few hours can process fully and be about 1m generally speaking, quartz or the glass medium bar of high about 12mm.With two symmetric double cross graphite supports eight identical medium strip are fixed in the discharge tube 3, each medium strip two ends are welded to pipe 3 inwalls respectively (are convenient welding, the outside, two ends with each medium strip grinds off a part in advance, English or glass material so that rockfill), from the outside medium strip is imposed spot welding in all the other positions again.But discharge tube operation break-down batch machining, production with diesis shape symmetrical distribution cross section.The ratio on the length limit of four slab region of diesis tee section is more moderate with 10: 1, this ratio with the length limit of the quarter bend device of Ling Yiming invention is that 5: 1 situation is approaching, and the diesis tee section pipe activation volume among the present invention then may reach about the octuple of quarter bend.After diesis tee section discharge tube processes, then clean with glass cleaning solution, clean repeatedly with deionized water then, after cleaned with its oven dry, again with speculum 1,2 by resonant cavity requirement sealing label in the discharge tube two ends, charge and exhaust pipe with discharge tube is communicated with high vacuum system again, is pumped into high vacuum (10
-6* 133.3 ρ
a) after fill helium, neon gaseous mixture.The resonant cavity of laser can be according to the structure, the parameter that laser transverse mode, power output, stability are waited the selective resonance chamber.The electrode of radio-frequency power supply 9 is two metal transport tapes 7, and when discharge tube surpassed 30cm length, the easily good discharge of acquisition of segmented radio frequency excitation was carried out in general consideration.
For example, with internal diameter Φ 30mm, wall thickness 1.5mm, one of the quartz ampoule of long 1m, get eight diameter 15mm, the quartz pushrod of long 99cm is satisfied with on the platform, with being about 20cm, radius of curvature is that the negative cylinder mild steel grinding tool of 15mm is joined diamond dust one side of eight rods is ground down symmetrically, make highest point grind off 1.5mm, it is 45 ° with angle again, the degree of depth is that the V-type groove mild steel grinding tool of 13.5mm is joined Buddha's warrior attendant sand milling opposite side, can process satisfactory eight medium strip, can obtain the cross section discharge tube of symmetric double cross through assembling and spot welding, each slab region of diesis shape tangent plane is wide to be 3mm, and long is 30mm, optical resonator adopts plano-concave sphere inner-cavity structure, concave mirror (reflectivity 99.9%) radius of curvature 3m, the plane mirror transmitance is 1.5%, is extracted into high vacuum (10 through charge and exhaust pipe 6
-6* 133.3p
a) after fill 0.8 * 133.3p
aHe, Ne gaseous mixture, the ratio of He and Ne are 7.5: 1, and radio-frequency power supply divides three sections to the discharge tube discharge, and rf frequency is got 10-20MHz, and total about 400-500W of injecting power then can obtain bigger 0.6328 μ m laser output.
Have the device of a cross or symmetrical many cross cross section discharge tube He-Ne laser that distributes, comprise discharge tube, complete Speculum, partially reflecting mirror, charge and exhaust pipe, radio-frequency power supply, transport tape, inductance coil, with reference to accompanying drawing 1, deielectric-coating is all-trans Penetrate mirror 1 and be connected with the port of discharge tube 3, deielectric-coating partially reflecting mirror 2 is connected charge and exhaust pipe with the another port of discharge tube 3 6 are locating to be connected from 2 several lis of partially reflecting mirrors with discharge tube 3, and transport tape 7 places the up and down both sides of discharge tube, radio-frequency power supply 9 Be connected with transport tape 7, inductance coil 8 is connected between the transport tape 7, and the cross section that it is characterized in that discharge tube is a cross Tee section or the symmetrical many star sections that distribute. The advantage of this device is:
1. this device is modular appliance, and the dispersion processing difficulty can be mass parts, whole laser instrument of Batch assemblage.
2. this device can provide bigger gain coefficient and very big active region, so can obtain big He-Ne Lasers power stage.
3. extremely compact, easy to use, the transportation of device.
Claims (3)
1. helium neon laser of forming by he-ne laser tube, optical resonator and laser radio-frequency power supply, the inwall that is characterised in that the discharge tube (3) of restriction gas activating medium is a star section or the symmetrical many star sections that distribute that are centered close on the discharge tube axis in the discharge cross section axial perpendicular to discharge tube, each star section can be considered two slab region and intersects vertically and form, and the ratio of the length bidimensional yardstick of slab region was moderate with 10: 1.
2. according to the described helium neon laser of claim 1, it is characterized in that perpendicular to axial N star section that is symmetrically distributed of discharge tube (3) it being to equal the discharge tube internal diameter, highly deduct the cross section of the region of discharge that the quartz of the wide a of 1/2nd cross section bar shapeds or glass medium bar (5) and discharge tube (3) combine for the discharge tube inside radius by the radius of curvature that 4N drift angle is 360 °/4N, bottom, it fixedly is to be formed by the spot welding between quartzy and quartz or glass and glass material, and N is 1 or 2 or other integer.
3. the He-Ne Lasers apparatus comprises quartz or glass discharge vessel (3), completely reflecting mirror (1), partially reflecting mirror (2), charge and exhaust pipe (6), radio-frequency power supply (9), metal transport tape (7), inductance coil (8), completely reflecting mirror (1) is connected with an end of discharge tube (3), partially reflecting mirror (2) is connected with the other end of discharge tube (3), charge and exhaust pipe (6) is being connected with discharge tube (3) from partially reflecting mirror (2) number centimeters, metal transport tape (7) places the upper and lower sides of discharge tube (3) to make the radio-frequency power supply electrode and uses, be connected with inductance coil (8) between metal transport tape (7) up and down, radio-frequency power supply (9) is connected with metal transport tape (7) up and down, it is characterized in that discharge tube (3) is one or N star section that is symmetrically distributed in the axial tangent plane of discharge tube (3) directly along weighing, on the axis that is centered close to discharge tube (3) of each star section, this N symmetrical distribution star section is to be 360 °/4N by 4N drift angle, the bottom curvature radius equals the discharge tube internal diameter, high be one of the minus thirty cross section of the region of discharge that the quartz of cross section bar shaped wide (a) or glass medium bar (5) and discharge tube (3) combine of discharge tube (3) inside radius, each star section is intersected vertically by two slab region and forms, the ratio of the length of slab region two dimension yardstick was moderate with 10: 1, and N is 1 or 2 or other integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100400053A CN100361353C (en) | 2004-06-16 | 2004-06-16 | Method for constituting compact-type He-Ne laser and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100400053A CN100361353C (en) | 2004-06-16 | 2004-06-16 | Method for constituting compact-type He-Ne laser and apparatus thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1710759A true CN1710759A (en) | 2005-12-21 |
| CN100361353C CN100361353C (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100400053A Expired - Fee Related CN100361353C (en) | 2004-06-16 | 2004-06-16 | Method for constituting compact-type He-Ne laser and apparatus thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326225A (en) * | 2013-06-20 | 2013-09-25 | 四川大学 | Device and method for realizing ship light |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4825280B1 (en) * | 1970-06-25 | 1973-07-27 | ||
| FR2530087B1 (en) * | 1982-07-09 | 1986-02-14 | Telecommunications Sa | GAS WAVEGUIDE LASER GENERATOR AND METHOD FOR MANUFACTURING THE WAVEGUIDE |
| CN85100563B (en) * | 1985-04-01 | 1987-03-04 | 南京工学院 | High power he-ne laser |
| DE3614878A1 (en) * | 1986-05-02 | 1987-11-12 | Siemens Ag | GAS LASER |
| JP3332004B2 (en) * | 1999-03-11 | 2002-10-07 | 日本電気株式会社 | Ion laser tube |
| CN1232011C (en) * | 2000-09-01 | 2005-12-14 | 四川大学 | He-Ne laser device |
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2004
- 2004-06-16 CN CNB2004100400053A patent/CN100361353C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326225A (en) * | 2013-06-20 | 2013-09-25 | 四川大学 | Device and method for realizing ship light |
| CN103326225B (en) * | 2013-06-20 | 2016-04-13 | 四川大学 | A kind of apparatus and method realizing ship light |
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| CN100361353C (en) | 2008-01-09 |
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Granted publication date: 20080109 Termination date: 20110616 |